Allow to select 3 (8s) NTP min poll value. Implements #9439
Allow to select 3 (8s) NTP min poll value. Implements #9439

NewEraCracker/pfsense,NewEraCracker/pfsense,pfsense/pfsense,pfsense/pfsense,dennypage/pfsense,pfsense/pfsense,NewEraCracker/pfsense,NewEraCracker/pfsense,pfsense/pfsense,dennypage/pfsense,dennypage/pfsense,dennypage/pfsense